Expansible septic tank



I aiming@ M. R. HYMN.

EXPANSIBLE SEPUC TANK.

APPLICATION mzn'MAR. 14'. 1921.

Patentef Aug. 3i), 1921.

mit. HYMAN, OF INDIAN'AIIPOLIS, INDIANA.

l EXPANSIBLE smvrrc marx.

Specification of Letters Patent. `Patnted- Aug', 30, 1921.

Application filed March 14, 1921. Serial No. 451,995.

lTo all whom it may concern:

Be it known that I, MAX R. HYMAN, a citizen of the United States,residing at Indianapolis, in the county ofMarion and State of Indiana'have invented a new and useful Expan'sible Septic Tank, of which thefollowing is a specification.

The object of my invention is to produce a series of concrete slabs ofsuch character that they may be readily handled manually and assembledby comparatively unskilled workmen into a septic tank of any desiredcapacity and shape in accordance with the needs and available area ofany particular location.

The accompanying drawings illustrate my invention: Figure 1 is afragmentary perspective'view of a three-compartment 'rei ceiving chamberof a septic tank formed by my improved sections or slabs; and Fig. 2 isa longitudinal section, on a smaller scale.

In the drawings 1() indicates a slab, pref'- erably of concrete suitablyreinforced, used as bottoms, tops and imperforate sides, to form acompartment. Slab 10 is preferably formed, as indicated, with acontinuous rabbet 11 around its sides so proportioned that six of saidslabs may be brought together in box form and sealed by a suitablecement at the joints.

I also provide special end slabs 12 perforated at 13 to receive astandard elbow 14 to slrve as inlet and outlet for the completed tanPerforated partition slabs 15 are provided to separate the system intothe successive chambers which are necessary to obtain the clarifying andsewage disposal action which is well known. In order to obtain desiredcapacity in the several chambers of the system I provide the peculiartwo-.part pary tition slab composed of the two identical parts orslabpieces 15-15 which are cut away at one corner, The precise manner ofform ot' the cut away portion being immaterial so long as there isprovided a sufficient footing width at the narrow part, as clearlyindicated in Fig. 1, the arrangement .hundred and twenty being such thattwo slab sections 15, when put together in any arrangement, will providea full and adequate support for the top slabs 10. The construction ofthese central slab members 15 is such that by varying the arrangement,as indicated in Fig. 1, a serpentine flow of liquids may be obtainedfrom one part of a chamber to-another. The cut-away portion or corner ofthe slab section 15 has a height less than the -normal working depthofthe liquid in the tanks so that the film 16 of microrganism will beunbroken by the flow of liquid from one.

part of the chamber to another.

It will be noted that the various slabs 10, 12, and 15--15 areinterchangeable so that all sorts of relative arrangements of successivesmall chambers, communicating with each other along the bottom, throughthe opening formed by the cut away portions of slabs 15, orcommunicating through the perforations 13, may be provided dependingupon the shape and area of the ground which may be available for placingof the system. The slabs are made of such size and weight that they maybe readily handled by two workmen who without any great skill, mayreadily produce from the standard slab elements, any desired septic 10.

Iclaini as my invention:

1. A septic tank formed from an interchangeable series of slab elementscomprising separate top, bottom and side elements, each'of said elementshaving a rabbet formed along each edge of one face andof substantiallyone half the thickness of the slab, and a two part partition, one cornerof each part being absent, substantially as shown and described.

2. A two part partition for septic tanks cooperatively formed by twoslab elements,

each of which has one corner absent substantially as shown anddescribed.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 5th day of March, A. D. one thousand nine one.

MAX R. HYMAN.

